“With more roundabouts than any other city in America, we really couldn’t let this week go by without having some fun and participating in the mission of advocating for roundabouts,” Mayor Jim Brainard said in a news release.

“We love our roundabouts, but what we love even more is the fact that they save lives, they reduce serious injuries in accidents and they are better for our commuters and the quality of the air.”

Throughout the week, shirts will be sold at All Things Carmel, 110 W Main St. "Roundabout-inspired" cookies — one in the shape of a heart — will be available at Main Street Treats, 216 W. Main St.

Residents pose in "We (heart) Roundabouts" shirts, one piece of Carmel's National Roundabout Week celebration. The shirts will be sold at All Things Carmel, 110 W Main St.(Photo11: Photos provided by the city of Carmel)

Books and Brews at Carmel City Center will host roundabout trivia from 7-9 p.m. Wednesday. Friday is "roundabout shirt" day.

The big party starts at 4 p.m. Friday, when businesses on Old Meridian near Carmel Drive will host a street party known as "Roundabout Midnight." There will be live music, food and adult beverages, according to the city.

Carmel is currently building a $28.7 million roundabout interchange at Keystone Avenue and 96th Street. Carmel and Indianapolis also recently reached a compromise that will yield roundabouts at Hazel Dell, Gray Road and Delegates Row.